/Engine/Source/Runtime/MovieScene/Public/EntitySystem/MovieSceneInitialValueCache.h
Find an initial value index given its object and custom accessor index
[TOptional](API\Runtime\Core\IO\TOptional)< [FInitialValueIndex](API\Runtime\MovieScene\EntitySystem\FInitialValueIndex) > FindPropertyIndex ( [UObject](API\Runtime\CoreUObject\UObject\UObject) * BoundObject, [FCustomPropertyIndex](API\Runtime\MovieScene\EntitySystem\FCustomPropertyIndex) AccessorIndex )